Audio-Technica PRO 31
Contents
1. OUTPUT CONNECTOR Integral 3 pin XLRM type CABLE 15 0 4 5 m cable with XLRF type connector at microphone end XLRM type connector at equipment end ACCESSORIES FURNISHED AT8470 Quiet Flex stand clamp for s 27 threaded stands 5 s 27 to s 16 threaded adapter soft protective pouch Tin the interest of standards development A T U S offers full details on its test methods to other industry professionals on request 1 Pascal 10 dynes cm 10 microbars 94 dB SPL Specifications are subject to change without notice Polar Pattern Frequency Response 10 dB LT 50 100 LEGEND Unlocked Locked Position Position S ef EJ Fig 1a Frequency in Hertz 12 or more on axis Do not try Do not turn to lock switch screw clockwise in the off to lock position audio technica Audio Technica U S Inc 1221 Commerce Drive Stow Ohio 44224 Audio Technica Limited Old Lane Leeds LS11 8AG England www audio technica com P3893 00180 P51677 EN 2004 Audio Technica U S Inc Printed in Taiwan Response in dB2. P R O 3 1 CARDIOID DYNAMIC MICROPHONE e SERIES MICROPHONES e Designed for close up vocal use e Silent on off operation thanks to MagnaLock switch design e Hi ENERGY neodymium magnet for improved output and transient response e Two stage ball type screen reduces wind noise and popping during close use e Corrosion resistant contacts from gold plated XLRM type connectors e Rugged design and construction for reliable performance e Cardioid polar pattern reduces pickup of sounds from the sides and rear improving isolation of desired sound source Output from the microphone s XLRM type connector is low impedance Lo Z balanced The signal appears across Pins 2 and 3 Pin 1 is ground shield Output phase is Pin 2 hot positive acoustic pressure produces positive voltage at Pin 2 Plug Type Ground Audio Audio XLR Pin 1 Pin 2 Pin 3 1 4 TRS Sleeve Tip Ring 1 4 Sleeve Tip Sleeve To avoid phase cancellation and poor sound all mic cables must be wired consistently Pin 1 to Pin 1 etc For a high impedance Hi Z mic input connect a Lo Z balanced cable to a Hi Z matching transformer A T CP8201 or equal at the equipment input When using the PRO 31 in settings with a stage monitor speaker the speaker should be located 180 off axis at the rear of the microphone This placement in conjunction with the microphone s uniform cardioid pickup pattern will virtually
3. eliminate the possibility of undesired audio feedback The PRO 31 utilizes a MagnaLock on off switch This specially designed switch operates silently and may be locked in the on position to prevent accidental turn off during use To lock slide the switch up into the on position Fig 1a Using a small flat head screwdriver rotate the small screw in the center of the switch 90 degrees 4 turn counter clockwise Fig 1b Never force the screw When the screw slot position is horizontal across the microphone body the switch is locked To unlock the switch turn the screw 90 degrees clockwise until the screw slot position is again vertical in line with the microphone body Never try to turn the switch more than 90 degrees or rotation The switch may only be locked in the on position Do not try to turn the screw when the switch is in the off position Take care to keep foreign particles from entering the windscreen An accumulation of iron or steel filings on the diaphragm and or foreign material in the windscreen s mesh surface can degrade performance PRO 31 SPECIFICATIONS ELEMENT Dynamic POLAR PATTERN Cardioid FREQUENCY RESPONSE 60 13 000 Hz OPEN CIRCUIT SENSITIVITY 55 dB 1 7 mV re 1V at 1 Pa IMPEDANCE 600 ohms SWITCH MagnaLock on off WEIGHT less cable and accessories 11 0 oz 312 g DIMENSIONS 7 28 185 0 mm long 2 09 53 1 mm head diameter
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